Harry Took a Series of Classes to Learn How to Play

Harry took a series of classes to learn how to play the clarinet and the saxophone from a music school that teaches the art at different levels to interested individuals.When he completed the course,he was given a certificate of completion to:

A) emphasize a relationship-marketing strategy.
B) serve as a tangible reminder of the course and to overcome the inseparability aspect of services.
C) make the course seem more homogenous with other learning experiences.
D) ensure that the art of playing these instruments would be preserved.